I'm pretty sure my Chocko rebuilt 16:1 manual steering box is the only part on my 69 that hasn't needed any work  I do have the roller idler arm from Opentracker, 245/40-18 tires up front, and I love it! I wouldn't add power steering if you paid me.

My 66 used to have factory manual steering with the quick ratio box. It drove great and I think it handled better than with the (now 19 year old) TCP power rack. My only complaint was trying to back up into a parking space at car shows was very labor intensive.  That statement borders on manual vs power debate so I will leave it at the “ drove great” statement. It had 235x45r17 tires.

My 66 had a standard manual box.  I had Randy rebuild it when I tore the car down.  The car eventually got an R&C MII front end, so I sold the unused rebuilt box to BillyC here, who drove it for years and loved it.  I have not heard from BillyC lately.

My 65 GT had less than good manual steering.  I pulled the box and had Chocko rebuild it.  He said it was a standard box from a 62 Falcon, but replaced everything it needed in short order.  It was great after that.  I did manage to get an original 65 GT box from a forum member here (who went Borg on his 65).  The current owner of my 65 had Chocko rebuild the 65GT box and loves it.  I still have regular contact with the current owner.  He sent me a video of driving down the road at highway speed, praising the car, and how it handles.  

My current Mustang has a power R&P, complete with the whining Ford pump. 

I loved the manual steering for everything except parallel parking.